This patchset adds perf callchain(FP/DWARF) support for RISC-V.
It comes from the csky version callchain support with some
slight modifications. The patchset base on Linux 5.3-rc6.
The patchset has some 'checkpatch.pl --strict' warnings:
WARNING: Use #include <linux/perf_regs.h> instead of <asm/perf_regs.h>
#141: FILE: tools/perf/arch/riscv/include/perf_regs.h:9:
+#include <asm/perf_regs.h>
CHECK: Avoid CamelCase: <Dwfl_Thread>
#329: FILE: tools/perf/arch/riscv/util/unwind-libdw.c:9:
+bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
CHECK: Avoid CamelCase: <Dwarf_Word>
#333: FILE: tools/perf/arch/riscv/util/unwind-libdw.c:13:
+ Dwarf_Word dwarf_regs[32];
As all the other Linux architectures use asm/perf_regs.h directly and
get these camelcases, I didn't try to fix them.
Changes since v6:
- add "WITH Linux-syscall-note" for uapi headers.
Changes since v5:
- use walk_stackframe from stacktrace.c to handle
kernel callchain unwinding(fix invalid mem access)
Changes since v4:
- Add missing PERF_HAVE_ARCH_REGS_QUERY_REGISTER_OFFSET
verified with extra CFLAGS(-Wall -Werror)
Changes since v3:
- Add more strict check for unwind_frame_kernel
- update for kernel 5.3
Changes since v2:
- fix inconsistent comment
- force to build kernel with -fno-omit-frame-pointer if perf
event is enabled
Changes since v1:
- simplify implementation and code convention
Signed-off-by: Mao Han <han_mao@xxxxxxxxx>
Cc: Paul Walmsley <paul.walmsley@xxxxxxxxxx>
Cc: Greentime Hu <green.hu@xxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxx>
Cc: linux-riscv <linux-riscv@xxxxxxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Guo Ren <guoren@xxxxxxxxxx>
Mao Han (2):
riscv: Add support for perf registers sampling
riscv: Add support for libdw
arch/riscv/Kconfig | 2 +
arch/riscv/include/uapi/asm/perf_regs.h | 42 ++++++++++++
arch/riscv/kernel/Makefile | 1 +
arch/riscv/kernel/perf_regs.c | 44 ++++++++++++
tools/arch/riscv/include/uapi/asm/perf_regs.h | 42 ++++++++++++
tools/perf/Makefile.config | 6 +-
tools/perf/arch/riscv/Build | 1 +
tools/perf/arch/riscv/Makefile | 4 ++
tools/perf/arch/riscv/include/perf_regs.h | 96 +++++++++++++++++++++++++++
tools/perf/arch/riscv/util/Build | 2 +
tools/perf/arch/riscv/util/dwarf-regs.c | 72 ++++++++++++++++++++
tools/perf/arch/riscv/util/unwind-libdw.c | 57 ++++++++++++++++
12 files changed, 368 insertions(+), 1 deletion(-)
create mode 100644 arch/riscv/include/uapi/asm/perf_regs.h
create mode 100644 arch/riscv/kernel/perf_regs.c
create mode 100644 tools/arch/riscv/include/uapi/asm/perf_regs.h
create mode 100644 tools/perf/arch/riscv/Build
create mode 100644 tools/perf/arch/riscv/Makefile
create mode 100644 tools/perf/arch/riscv/include/perf_regs.h
create mode 100644 tools/perf/arch/riscv/util/Build
create mode 100644 tools/perf/arch/riscv/util/dwarf-regs.c
create mode 100644 tools/perf/arch/riscv/util/unwind-libdw.c
--
2.7.4
